# US 11,114,698 B2 · Method of preparing pouch type secondary battery

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- Number: US 11,114,698 B2
- Document ID: US11114698B2
- Status: Granted
- Kind: B2
- Application number: 16/766,324
- Filed: 2019-03-22
- Published: 2020-11-19
- Granted: 2021-09-07
- Earliest claimed: 2018-03-26
- Assignees: LG Chem, Ltd.
- Applicants: LG Chem, Ltd.
- Inventors: Won Kyung Shin; Jae Won Lee; Kyoung Ho Ahn; Chui Haeng Lee
- Web page: https://patentgrep.com/patent/US11114698B2

## CPC

- H01M 10/052: Li-accumulators
- H01M 10/058: Construction or manufacture
- H01M 4/0447: {of complete cells or cells stacks}
- H01M 10/049: {Processes for forming or storing electrodes in the battery container}
- H01M 10/0565: Polymeric materials, e.g. gel-type or solid-type
- H01M 10/446: {Initial charging measures}
- H01M 50/609: Arrangements or processes for filling with liquid, e.g. electrolytes
- H01M 2300/0085: Immobilising or gelification of electrolyte
- Y02E 60/10: Energy storage using batteries
- Y02P 70/50: Manufacturing or production processes characterised by the final manufactured product
- H01M: PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- Y02E: REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02P: CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS

## Abstract

The present invention relates to a method of preparing a pouch type secondary battery, and particularly to a method of preparing a pouch type secondary battery which includes preparing a pouch type preliminary secondary battery by accommodating an electrode assembly in an inner space of a pouch type case, disposing a metallic ultrasonic member by being closely attached to both surfaces of the pouch type preliminary secondary battery, injecting a composition for a gel polymer electrolyte into the pouch type preliminary secondary battery, applying ultrasonic vibration to the pouch type preliminary secondary battery while pressurizing the pouch type preliminary secondary battery using the ultrasonic member, performing formation on the pouch type preliminary secondary battery, curing the composition for a gel polymer electrolyte, and degassing, wherein the ultrasonic member is maintained at a temperature of 30° C. to 80° C., and the pressurizing of the pouch type preliminary secondary battery is performed while applying a pressure of 0.1 kgf/cm2 to 3,000 kgf/cm2 per area of the pouch type preliminary secondary battery.

## Claims

### Claim 1

A method of preparing a pouch secondary battery, the method comprising:
accommodating an electrode assembly in an inner space of a pouch case to form a pouch preliminary secondary battery;
disposing a metallic ultrasonic member by being closely attached to both surfaces of the pouch type preliminary secondary battery;
injecting a composition for a gel polymer electrolyte into the pouch preliminary secondary battery;
applying ultrasonic vibration to the pouch preliminary secondary battery while pressurizing the pouch preliminary secondary battery using the metallic ultrasonic member;
performing formation of the pouch preliminary secondary battery;
curing the composition for a gel polymer electrolyte; and
degassing,
wherein the metallic ultrasonic member is maintained at a temperature of 30° C. to 80° C., and
the pressurizing of the pouch preliminary secondary battery is performed while applying a pressure of 0.1 kgf/cm2 to 3,000 kgf/cm2 per area of the pouch preliminary secondary battery.

### Claim 2 (depends on 1)

The method of claim 1, wherein the metallic ultrasonic member comprises a metallic material selected from the group consisting of stainless steel, iron, aluminum, copper, nickel, and alloys of two or more thereof.

### Claim 3 (depends on 1)

The method of claim 1, wherein the metallic ultrasonic member comprises stainless steel or aluminum.

### Claim 4 (depends on 1)

The method of claim 1, wherein the metallic ultrasonic member is formed in a structure surrounding an entire surface of the pouch preliminary secondary battery.

### Claim 5 (depends on 1)

The method of claim 1, wherein the metallic ultrasonic member is maintained at a temperature of 30° C. to 60° C.

### Claim 6 (depends on 1)

The method of claim 1, wherein the pressurizing of the pouch preliminary secondary battery is performed by applying a pressure of 0.1 kgf/cm2 to 500 kgf/cm2 per area of the pouch type preliminary secondary battery.

### Claim 7 (depends on 1)

The method of claim 1, wherein the pressurizing of the pouch preliminary secondary battery is performed by applying a pressure of 0.1 kgf/cm2 to 100 kgf/cm2 per area of the pouch type preliminary secondary battery.

### Claim 8 (depends on 1)

The method of claim 1, wherein the applying of the ultrasonic vibration comprises applying vibration having a frequency of 20 kHz to 200 MHz.

### Claim 9 (depends on 1)

The method of claim 1, wherein the applying of the ultrasonic vibration is performed simultaneously with the injecting of the composition for a gel polymer electrolyte.

### Claim 10 (depends on 1)

The method of claim 1, further comprising applying ultrasonic vibration after the formation and before the curing of the composition for a gel polymer electrolyte.